Research On The Failure Rule Of Container Building Under Internal Blast Loding

The construction of civil infrastructure is the direction of the transformation and development of China's construction.The container building is a kind of industrial structure with high degree of pre-fabrication and assembly,which has become a hot spot in the field of industrial modular construction with the advantages of convenient assembly,fast construction speed,energy saving and low cost.Since the 21st century,the explosion prevention of construction became more important since accidental explosion accidents occurred frequently caused heavy casualties and property losses.Modular building,a new type of building structure,is widely used in industrial and civil buildings,which is inevitably subjected to explosive loads.But it is different from the traditional reinforced concrete frame structure,thus,It is necessary to study the dynamic response and fracture characteristics of the container building under blast loading.In this paper,the fluid-structure coupling algorithm is used to studied the destruction rule of container building under internal explosive loading in Is-dyna software.The main research contents and results including the following aspects:(1)The numerical simulation of the dynamic response of a square steel plate under blast loading is carried out by using two modeling methods of solid element and shell element.The differences between the two modeling methods on the results of the calculation was analyzed and compared with available experimental data.Therefore,the accuracy of the geometric model?the rationality of the material parameters and the material model were verified.(2)Three-dimensional numerical model of a single container is established.The influence of different factors on the fracture of container is analyzed.The results of the two modeling methods were compared and analyzed.The results show that in the outer wall of the container and the corner,with the increase of the charge,the fracture of the container is aggravated,if the charge continues to increase,the wall of the container has a cross shaped hole;the wall thickness of the container has an influence on the deformation of the container,the thicker the wall thickness,the smaller the deflection of the container;the displacement at the center of the wall varies with the constraint;comparing the results of two modeling methods under different conditions,the calculation results are basically the same with the solid element and shell element,the shell element can greatly reduce the number of the element and improve the computational efficiency of 50%.(3)The whole structure of nine container splicing was established,the deformation and fracture process of the whole structure under implosion loading was simulated by the shell element.The damage characteristics and failure mechanism of the structure were analyzed.The simulation of different TNT equivalent was carried out,the damage mechanism of the container under various working conditions was analyzed and the corresponding damage graphs were obtained.Finally,the work done in this paper was summarized and the further work was prospected.